Purpose :
Full shape crystalline lens quantification is critical to improve state-of-the-art intraocular lens (IOL) selection in cataract surgery. We estimated lens volume (VOL), surface area (SA), diameter (DIA) and equatorial plane position (EPP) in patients before cataract surgery, and we evaluated the EPP as an estimator of post-operative IOL position (ELP).

Methods :
The anterior segment of 7 eyes (76±8 y.o, range, 66-87 y.o) from 6 patients before cataract surgery and 1 eye (80 y.o) post-operatively (Aspheric monofocal Asphina IOL, Zeiss) were imaged and quantified using a custom-developed 3-D Optical Coherence Tomography (OCT) system provided with distortion correction algorithms. Whole crystalline lens 3-D models were constructed from the information visible through the pupil (Martinez-Enriquez et al. IOVS 2016), and VOL, SA, DIA, lens thickness (LT) and EPP (distance from the anterior lens apex to the equatorial plane) were estimated pre-operatively. EPP was used as estimator of ELP. The estimation error was compared with state-of-the-art methods, namely: ELP=LT/2; Rosen et al. (2006) constant: ELP=0.41LT; and the intersection approach, where the ELP is estimated as the plane of intersection between anterior and posterior lens best fitting conicoid surfaces.